Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o desempenho geral do jogador running back?
 ###Tabelas: CREATE TABLE  (_id AUTO_INCREMENT PRIMARY KEY, Round INT, Pick # INT, Overall INT, Name VARCHAR, Position VARCHAR, College VARCHAR) CREATE TABLE first_round_selections (first_round_selections_id AUTO_INCREMENT PRIMARY KEY, Pick INT, Player VARCHAR, Team VARCHAR, Position VARCHAR, School VARCHAR) CREATE TABLE 2011_season (2011_season_id AUTO_INCREMENT PRIMARY KEY, Week INT, Date VARCHAR, Visiting Team VARCHAR, Final Score VARCHAR, Host Team VARCHAR, Stadium VARCHAR) CREATE TABLE suburbs (suburbs_id AUTO_INCREMENT PRIMARY KEY, Suburb VARCHAR, Population (in 2008) INT, Median age (in 2006) VARCHAR, Mean household size (in 2006) VARCHAR, Area (km²) VARCHAR, Density (/km²) INT, Date first settled as a suburb INT, Gazetted as a Division Name VARCHAR) CREATE TABLE list_of_geothermal_power_stations (list_of_geothermal_power_stations_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Location VARCHAR, Field VARCHAR, Capacity (MW) INT, Annual Generation (average GWh) VARCHAR, Commissioned VARCHAR)  
SELECT Overall FROM  WHERE Position = running back